I would like to find all the records that have missing details, but are in multiple events.

So something like this: ( I apoligize for my pseudo code i'm just trying to figure out scripting.)

FIND MODE

Field Title (search for =) all empty fields

Field Copy (search for =) all empty fields

Field Copy2 (search for =) all empty fields

enter events (555555,666666,777777) or instead of comma is it AND

PERFORM FIND

So this would give me all items within these 3 events that have no title, copy or copy 2.

Ideally I would like the option to manually select the fields to be searched (There's 21 or so.)

The Sorting of the file shouldn't be an issue as i will export these as an excell and can do mini sorts there.

It's not a comma nor an AND: it's a New Request. So in your example you'd have 3 find requests, one for each number.